mdw@git.distorted.org.uk Git - adns/blob - src/types.c

   1 /*
   2  * types.c
   3  * - RR-type-specific code, and the machinery to call it
   4  */
   5 /*
   6  *  This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2, or (at your option)
  11  *  any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software Foundation,
  20  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include <arpa/inet.h>
  24
  25 #include "internal.h"
  26
  27 static adns_status pa_inaddr(adns_query qu, int serv,
  28                              const byte *dgram, int dglen, int cbyte, int max,
  29                              void *store_r) {
  30   struct in_addr *dr= store_r;
  31
  32   if (max-cbyte != 4) return adns_s_invaliddata;
  33   memcpy(dr,dgram+cbyte,4);
  34   return adns_s_ok;
  35 }
  36
  37 static adns_status cs_inaddr(vbuf *vb, const void *data) {
  38   const struct in_addr *dp= data;
  39   const char *ia;
  40
  41   ia= inet_ntoa(*dp); assert(ia);
  42   return adns__vbuf_appendstr(vb,ia) ? adns_s_ok : adns_s_nolocalmem;
  43 }
  44
  45 static void fr_null(adns_query qu, void *data) { }
  46
  47 #define TYPE_SF(size,func,cp,free) size, pa_##func, fr_##free, cs_##cp
  48 #define TYPE_SN(size,func,cp)      size, pa_##func, fr_null, cs_##cp
  49 #define TYPESZ_M(member)           (sizeof(((adns_answer*)0)->rrs.member))
  50 #define TYPE_MF(memb,parse)        TYPE_SF(TYPESZ_M(memb),parse,memb,memb)
  51 #define TYPE_MN(memb,parse)        TYPE_SN(TYPESZ_M(memb),parse,memb)
  52
  53 #define DEEP_MEMB(memb) TYPESZ_M(memb), fr_##memb, cs_##memb
  54 #define FLAT_MEMB(memb) TYPESZ_M(memb), fr_null, cs_##memb
  55 #define NULL_MEMB       0, fr_null, cs_null
  56
  57 /* TYPE_<ms><nf>
  58  *  ms is M  specify member name
  59  *     or S  specify size explicitly
  60  *  nf is F  full memory management, dependent on member name or specified func
  61  *        N  no memory management required
  62  */
  63
  64 static const typeinfo typeinfos[] = {
  65   /* Must be in ascending order of rrtype ! */
  66   /* rr type code   rrt     fmt        mem.mgmt  member      parser        */
  67
  68   { adns_r_a,       "A",     0,        FLAT_MEMB(inaddr),    pa_inaddr      },
  69 #if 0 /*fixme*/
  70   { adns_r_ns_raw,  "NS",   "raw",     DEEP_MEMB(str),       pa_domain_raw  },
  71   { adns_r_cname,   "CNAME", 0,        DEEP_MEMB(str),       pa_domain_raw  },
  72   { adns_r_soa_raw, "SOA",  "raw",     DEEP_MEMB(soa),       pa_soa         },
  73   { adns_r_null,    "NULL",  0,        NULL_MEMB,            pa_null        },
  74   { adns_r_ptr_raw, "PTR",  "raw",     DEEP_MEMB(str),       pa_domain_raw  },
  75   { adns_r_hinfo,   "HINFO", 0,        DEEP_MEMB(strpair),   pa_hinfo       },
  76   { adns_r_mx_raw,  "MX",   "raw",     DEEP_MEMB(intstr),    pa_mx_raw      },
  77   { adns_r_txt,     "TXT",   0,        DEEP_MEMB(str),       pa_txt         },
  78   { adns_r_rp_raw,  "RP",   "raw",     DEEP_MEMB(strpair),   pa_rp          },
  79
  80   { adns_r_ns,      "NS",   "+addr",   DEEP_MEMB(dmaddr),    pa_dmaddr      },
  81   { adns_r_ptr,     "PTR",  "checked", DEEP_MEMB(str),       pa_ptr         },
  82   { adns_r_mx,      "MX",   "+addr",   DEEP_MEMB(intdmaddr), pa_mx          },
  83
  84   { adns_r_soa,     "SOA",  "822",     DEEP_MEMB(soa),       pa_soa         },
  85   { adns_r_rp,      "RP",   "822",     DEEP_MEMB(strpair),   pa_rp          },
  86 #endif
  87 };
  88
  89 const typeinfo *adns__findtype(adns_rrtype type) {
  90   const typeinfo *begin, *end, *mid;
  91
  92   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
  93
  94   while (begin < end) {
  95     mid= begin + ((end-begin)>>1);
  96     if (mid->type == type) return mid;
  97     if (type > mid->type) begin= mid+1;
  98     else end= mid;
  99   }
 100   return 0;
 101 }